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(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (10) International Publication Number (43) International Publication Date PCT 15 February 2007 (15.02.2007) WO 2007/017898 A3 (51) International Patent Classification: (74) Agents: MADAN, Jose, A. et al; Khaitan & Co., Meher BOlJ 23/90 (2006.01) C07H 17/00 (2006.01) Chambers, 4th & 5th Floors, R K Marg, Ballard Estate, BOlJ 23/42 (2006.01) Mumbai 400 038 (IN). (21) International Application Number: (81) Designated States (unless otherwise indicated, for every PCT/IN2006/000178 kind of national protection available): AE, AG, AL, AM, AT,AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, (22) International Filing Date: 24 May 2006 (24.05.2006) CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, (25) Filing Language: English KG, KM, KN, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, LY,MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, (26) Publication Language: English NO, NZ, OM, PG, PH, PL, PT, RO, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, (30) Priority Data: UZ, VC, VN, YU, ZA, ZM, ZW 626/MUM/2005 24 May 2005 (24.05.2005) IN (84) Designated States (unless otherwise indicated, for every (71) Applicant (for all designated States except US): KO- kind of regional protection available): ARIPO (BW, GH, PRAN RESEARCH LABORATORIES LTD. [IN/IN]; GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, Parijat House, 1076 Dr E Moses Road, Worli, Mumbai ZW), Eurasian (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), 400 018 (IN). European (AT,BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, LV,MC, NL, PL, PT, (72) Inventors; and RO, SE, SI, SK, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, (75) Inventors/Applicants (for US only): GUPTE, Rajan, GN, GQ, GW, ML, MR, NE, SN, TD, TG). Vitthal [IN/IN]; Kopran Research Laboratories Lim ited, D-28/2, TTC Industrial Area, MIDC. Turbhe, Navi Declarations under Rule 4.17: Mumbai 400 705, Maharashtra (IN). HIRE, Chandrab- — as to applicant's entitlement to apply for and be granted a han, Madhav [IN/IN]; Kopran Research Laboratories patent (Rule 4.17(U)) Ltd., D-28/2, T T C Industrial Area, M I D C, Turbhe, — of inventor ship (Rule 4.17 (iv)) Navi Mumbai 400 705 (IN). SABADE, Kishore, Balaji [IN/IN]; Kopran Research Laboratories Ltd., D-28/2, T T Published: C Industrial Area, M I D C, Turbhe, Navi Mumbai 400 705, — with international search report Maharashtra (IN). ACHARYA, Rakesh [IN/IN]; Tambet Bhavan, Behind Vireshwar Temple, Mahad, Dist RaI- (88) Date of publication of the international search report: gad 402 301 (IN). MHAMUNKAR, Deepak, Bhaurao 26 April 2007 [IN/IN]; Samarth Nagar, At/Post-Utekhol, TaI - Mangaon, Dist Raigad, Maharashtra (IN). BHAU, Jadhav, Santosh For two-letter codes and other abbreviations, refer to the "G uid [IN/IN] ; c/o Arun Deshmukh, Opp Vireshwar Temple, TaI ance Notes on Codes and Abbreviations" appearing at the beg in Mahad, Dist Raigad 402301, Maharashtra (IN). ning of each regular issue of the PCT Gazette. (54) Title: A PROCESS OF RECOVERY OF PT/C CATALYST IN THE PREPARATION OF AZITHROMYCIN DIHYDRATE (57) Abstract: A process of recovery of Pt/C catalyst from the hydrogenation of 6,9-Imino ether is carried out by isolating spent Pt/C by filtration, reactivating the wet spent Pt/C catalyst by treating the spent Pt/C with strong acid like perchloric acid and recycling the reactivated catalyst along with fresh catalyst in the weight ratio of 98:2 in next cycle of hydrogenation of 6,9-Imino ether. The regenerated catalyst and its use in the hydrogenation of 6,9-Imino ether for atleast ten cycles are also disclosed herein. INTERNATIONAL SEARCH REPORT International application No PCT/IN 2006/000178 A CLASSIFICATION OF SUBJECT MATTER IPC 8 BOU 23/90 (2007 0 1), BOU 23/42 (2007.01 ); C07H 17/00 (2007.01 ) According to International Patent Classification (IPC) or to both national classification and IPC B FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) IPC 8: BOU, C07H Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) EPODOC WPI C DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No WO 2002/044193 A 1 (ERCROS INDUSTRIAL, S.A.) 1-5 6 June 2002 (06 06 2002) Claims 1-6; examples 1-3. I I Further documents are listed in the continuation of Box C. See patent family annex * Special categories of cited documents "T" later document published after the international filing date or "A" document defining the geneial state of the art which is not considered priority date and not m conflict with the application but cited to be of particular relevance to understand the principle or theory underlying the invention "E" earlier application or patent but published on or after the international "X" document of particular relevance, the claimed invention filing date cannot be considered novel or cannot be considered to involve "L" document which may throw doubts on priority claim(s) or which is an inventive step when the document is taken alone cited to establish the publication date of another citation or other "Y" document of particular relevance, the claimed invention special reason (as specified) cannot be consideied to involve an inventive step when the "O" document referring to an oral disclosure, use, exhibition or other document is combined with one or more other such means documents, such combination being obvious to a person "P" document published prior to the international filing date but later than skilled in the art the priority date claimed "&" document member of the same patent family Date of the actual completion of the international search Date of mailing of the international search report 23 January 2007 (23.01.2007) 30 January 2007 (30 01.2007) Name and mailing address of the ISA/ AT Authorized officer Austrian Patent Office PUSTERER F Dresdner Straβe 87, A-1200 Vienna Facsimile No +43 / 1 / 534 24 / 535 Telephone No +43 / 1 / 534 24 / 3 11 Form PCT/ISA/210 (second sheet) (January 2004) International a lication No. INTERNATIONAL SEARCH REPORT DD Information on patent family members PCT/IN2006/000178 Publication Patent document cited Publication Patent family date in search report date member(s) WO 2002/044193 FormPCr/ISA/210 (patent familyannex) (July 1998; reprint January 2004).