This invention provides cholesterol absorption inhibitors of Formula I:
and the pharmaceutically acceptable salts thereof, wherein R
12
is an alkyl, alkeny or alkynyl group mono- or poly-substituted with —OH, —COOH or a combination of —OH and —COOH, and R
9
contains an alkyl, alkeny or alkynyl group substituted with a heterocyclic ring, amino or sulfonyl. The compounds are useful for lowering plasma cholesterol levels, particularly LDL cholesterol, and for treating atherosclerosis and preventing atherosclerotic disease events.
1,1,2‐Trifunctionalization of Terminal Alkynes by Radical Addition–Translocation–Cyclization–Trapping for the Construction of Highly Substituted Cyclopentanes
作者:Youqing Yang、Constantin G. Daniliuc、Armido Studer
DOI:10.1002/anie.202011785
日期:2021.1.25
Radical 1,1,2‐trifunctionalization of terminal alkynes by an addition–translocation–cyclization–trapping sequence using readily available alkynyl triflones as trifluoromethyl radical precursors and trapping reagents is reported. Cascades occur by addition of the trifluoromethyl radical to a terminal alkyne, 1,5‐hydrogen atom transfer, 5‐exo‐cyclization, and subsequent alkynylation to provide (1‐tr
A gold(I)-catalyzed cycloisomerization/ring expansion sequence allows the highly enantioselective synthesis of 2-oxocyclobutylcyclopentane derivatives from cyclopropyl-substituted enynes. The bimetallic [(R)-MeO-DTBM-BIPHEP-(AuCl)2] complex was found to be the best precatalyst, affording the desired cyclobutanones in high yields and enantioselectivities (up to 99% ee). The usefulness of the method
Silver-Catalyzed Cascade 1,6-Addition/Cyclization of <i>para</i>-Quinone Methides with Propargyl Malonates: An Approach to Spiro[4.5]deca-6,9-dien-8-ones
作者:Zhenbo Yuan、Lina Liu、Rui Pan、Hequan Yao、Aijun Lin
DOI:10.1021/acs.joc.7b01400
日期:2017.8.18
6-addition/5-exo-dig cyclization reaction between para-quinone methides and propargyl malonates under mild reaction conditions has been described. This reaction provides an efficient method to construct versatile spiro[4.5]cyclohexadienones in moderate to excellent yields with high atom economy and scalability.