Asymmetric alkylation and sulphenylation of chiral O-silylated imide enolates.
作者:Rikki P. Alexander、Ian Paterson
DOI:10.1016/s0040-4039(00)95033-0
日期:1985.1
The chiral O-silylated enolates (5) can be alkylated or sulphenylated with high diastereoselectivity (∼20:1) by 1,3-dithienium fluoroborate or PhSCl. Phenylthio-alkylation, in contrast, proceeds with low diastereoselectivity.
Ketene N,O-acetals were prepared stereoselectively and submitted to a Lewis acid-mediated 1,3-rearrangement to afford C-alkylated products. The reactions proceeded in a stereoselective manner to construct a chiral quaternary carbon in high selectivity. The stereochemistry of the quaternary center was found to be opposite to that obtained by an anionic direct dienolate alkylation.
Process for preparation of lactone derivatives and intermediates thereof
申请人:PHARMARESOURCES (SHANGHAI) CO., LTD.
公开号:US10611739B2
公开(公告)日:2020-04-07
A novel process for the preparation of lactone derivatives, and intermediates thereof is described. The lactone derivatives are important precursors for the synthesis of anti-hepatitis C virus agents, including sofosbuvir.
KENDE, ANDREW S.;KAWAMURA, KUNIAKI;ORWAT, MICHAEL J., TETRAHEDRON LETT., 30,(1989) N3, C. 5821-5824
作者:KENDE, ANDREW S.、KAWAMURA, KUNIAKI、ORWAT, MICHAEL J.
DOI:——
日期:——
PROCESS FOR PREPARATION OF LACTONE DERIVATIVES AND INTERMEDIATES THEREOF
申请人:PHARMARESOURCES (SHANGHAI) CO., LTD.
公开号:US20190210981A1
公开(公告)日:2019-07-11
A novel process for the preparation of lactone derivatives, and intermediates thereof is described. The lactone derivatives are important precursors for the synthesis of anti-hepatitis C virus agents, including sofosbuvir.