A process of reductive amination efficiently yields an HIV protease inhibitor.
一种还原胺化的过程高效地产生了一种HIV蛋白酶抑制剂。
[EN] PROCESS FOR MAKING AN EPOXIDE VIA THE IODOHYDRIN<br/>[FR] PROCEDE DE FABRICATION D'UN EPOXYDE PAR L'INTERMEDIAIRE DE L'IODOHYDRINE
申请人:MERCK & CO., INC.
公开号:WO1997006164A1
公开(公告)日:1997-02-20
(EN) A process for synthesizing the epoxide of formula (I), consists of, at a minimum, formation of a halohydrin from the allyl acetonide reactant, followed by base-induced cyclization, the epoxide product (I) being useful as an intermediate for the synthesis of inhibitors of renin or HIV protease or other proteases.(FR) La présente invention concerne un procédé de synthèse de l'époxyde représenté par la formule: et qui comprend au minimum la formation d'halohydrine à partir du réactant allyle acétonide, suivie de la cyclisation déclenchée par une base. Le produit époxy de formule I est utile comme produit intermédiaire pour la synthèse d'inhibiteurs de la rénine ou de la protéase du VIH ou d'autres protéases.
Harvesting short-lived hypoiodous acid for efficient diastereoselective iodohydroxylation in Crixivan® synthesis
作者:Carl R LeBlond、Kai Rossen、Frank P Gortsema、Ilia A Zavialov、Steven J Cianciosi、Arthur T Andrews、Yongkui Sun
DOI:10.1016/s0040-4039(01)01863-9
日期:2001.12
The evasive hypoiodousacid is generated in situ from NaOCl and NaI and used efficiently for clean iodohydroxylation of 1, producing the Crixivan® intermediate 2 in high yield with highly efficient 1,3-asymmetric induction. This pH-tunable process allows HOI generation at a pH optimal for supressing byproduct formation in pH-sensitive iodohydroxylation reactions.
Reaction of 2-alkyl-4-enamides 2, 9-15 with NIS and aqueous sodium bicarbonate results in the diastereoselective formation of the corresponding iodohydrins 3, 16-22 with essentially no iodolactone by-product. This methodology has been successfully employed for the synthesis of the epoxide intermediate 4 of the orally active Merck HIV-I protease inhibitor L-735,524.
Mechanistic studies on the diastereoselective halohydroxylation of γ-δ unsaturated carboxamides
作者:K Rossen、R.A Reamer、R.P Volante、P.J Reider
DOI:10.1016/0040-4039(96)01529-8
日期:1996.9
Evidence is presented that the diastereoselective iodohydroxylation of the the gamma-delta unsaturated amide 2 proceeds without involvement of iminium ion 12 directly to the tetrahedral intermediate 17 and its subsequent endocyclic cleavage to 3. Copyright (C) 1996 Elsevier Science Ltd