The general preparation of enantiopure monoacidside-chains of several esters of cephalotaxine is described. The strategy, similar to Weinreb's approach to the synthesis of deoxyharringtonine, used as key intermediate the chiral nonracemic epoxide 11a prepared from the commercially available monomethyl itaconate (8). The key step of the strategy was the ring-opening of the epoxide 11a by using different
Can a Ketone Be More Reactive than an Aldehyde? Catalytic Asymmetric Synthesis of Substituted Tetrahydrofurans
作者:Sunggi Lee、Han Yong Bae、Benjamin List
DOI:10.1002/anie.201806312
日期:2018.9.10
O‐heterocycles bearing tetrasubstituted stereogenic centers are prepared via catalytic chemo‐ and enantioselective nucleophilic additions to ketoaldehydes, in which the ketone reacts preferentially over the aldehyde. Five‐ and six‐membered rings with both aromatic and aliphatic substituents, as well as an alkynyl substituent, are obtained. Moreover, 2,2,5‐trisubstituted and 2,2,5,5‐tetrasubstituted
Synthesis of the ester side chains of some potently antileukemic harringtonia alkaloids from chiral citrates
作者:Rachael A. Ancliff、Andrew T. Russell、Adam J. Sanderson
DOI:10.1039/b605339d
日期:——
The selective reduction of one of the three carboxyl groups of two chiral citric acid derivatives to the corresponding aldehydes, under Rosenmund conditions, are reported together with the application of these aldehydes to the syntheses of the ester side chains of some potently antileukemic Cephalotaxus alkaloids e.g. anhydroharringtonine.
CEPHALOTAXUS ESTERS, METHODS OF SYNTHESIS, AND USES THEREOF
申请人:Gin David
公开号:US20110071097A1
公开(公告)日:2011-03-24
The present invention provides novel cephalotaxus esters, syntheses thereof, and intermediates thereto. The invention also provides pharmaceutical compositions comprising a compound of the present invention and methods of using said compounds or compositions in the treatment of proliferative diseases (e.g., benign neoplasm, cancer, inflammatory disease, autoimmune disease, diabetic retinopathy) and infectious disease. The invention further provides methods of using said compounds or compositions in the treatment of multidrug resistant cancer.