Highly Enantioselective Synthesis of α,α-Dialkylmalonates by Phase-Transfer Catalytic Desymmetrization
作者:Suckchang Hong、Jihye Lee、Minsik Kim、Yohan Park、Cheonhyoung Park、Mi-hyun Kim、Sang-sup Jew、Hyeung-geun Park
DOI:10.1021/ja110349a
日期:2011.4.6
A novel enantioselective synthetic method for the construction of a quaternary carbon center from malonates via phase-transfer catalytic (PTC) alkylation has been developed. The asymmetric α-alkylation of diphenylmethyl tert-butyl α-alkylmalonates with alkylating agents under phase-transfer catalysis conditions (aq 50% KOH, toluene, 0 °C) in the presence of (S,S)-3,4,5-trifluorophenyl-NAS bromide (8)
A new enantioselective synthetic method for α-halo-α-alkylmalonates is reported. α-Alkylation of diphenylmethyl tert-butyl α-halomalonates under phase-transfer catalytic conditions (solid KOH, toluene, −40 °C) in the presence of (S,S)-3,4,5-trifluorophenyl-NAS bromide (5 mol%) afforded diphenylmethyl tert-butyl α-halo-α-alkylmalonates in very high chemical yields (up to 99%) and optical yields (up
Piperazine derivatives as inhibitors of stearoyl-CoA desaturase
申请人:Forest Laboratories Holdings Limited
公开号:US08039463B2
公开(公告)日:2011-10-18
The present invention relates to piperazine derivatives that act as inhibitors of stearoyl-CoA desaturase. The invention also relates to methods of preparing the compounds, compositions containing the compounds, and to methods of treatment using the compounds.
NOVEL PIPERAZINE DERIVATIVES AS INHIBITORS OF STEAROYL-CoA DESATURASE
申请人:Sundaresan Kumar
公开号:US20090239848A1
公开(公告)日:2009-09-24
The present invention relates to piperazine derivatives that act as inhibitors of stearoyl-CoA desaturase. The invention also relates to methods of preparing the compounds, compositions containing the compounds, and to methods of treatment using the compounds.