NHC-Catalyzed Spiro Bis-Indane Formation via Domino Stetter−Aldol−Michael and Stetter−Aldol−Aldol Reactions
摘要:
Two novel domino NHC-catalyzed spirocyclizations are described herein, enabling the rapid construction of three new carbon-carbon bonds and a quaternary center with high diastereoselectivity. A variety of Spiro bis-indane structures are assembled in a single step from simple o-phthaldialdehyde derivatives.
Organocatalytic, Enantioselective, Intramolecular Oxa-Michael Reaction of Alkoxyboronate: A New Strategy for Enantioenriched 1-Substituted 1,3-Dihydroisobenzofurans
An unprecedented strategy for the synthesis of enantioenriched 1-substituted 1,3-dihydroisobenzofurans via an enantioselective oxa-Michael reaction of o-alkoxyboronate containing chalcone (II) has been accomplished employing cinchona alkaloid based squaramide bifunctional organocatalyst in the presence of proton source. The corresponding alkoxyboronate intermediates have been readily prepared in situ
在质子源存在下,使用基于金鸡纳生物碱的方酰胺双功能有机催化剂,通过含有查耳酮 ( II ) 的邻烷氧基硼酸酯的对映选择性 oxa-Michael 反应,实现了合成对映体富集的 1-取代 1,3-二氢异苯并呋喃的前所未有的策略。使用中性硼烷作为氢化物源和作为催化剂对应物的叔胺部分,可以容易地由邻甲酰基查尔酮原位制备相应的烷氧基硼酸酯中间体。
Stereoselective synthesis of aminoindanols via an efficient cascade aza-Michael–aldol reaction
作者:Hui Qian、Wanxiang Zhao、Herman H-Y. Sung、Ian D. Williams、Jianwei Sun
DOI:10.1039/c2cc37102b
日期:——
An efficient organocatalyzed strategy for the synthesis of 3-amino-1-indanols has been developed. This method is complementary to the conventional FriedelâCrafts strategy. It is also applicable to the synthesis of enantioenriched 3-amino-1-indanols.
An efficient straightforward metal free domino approach was developed for the synthesis of various 8-hydroxy-2,8-dihydroindeno[2,1-c]pyrazoles via [3 + 2] cycloaddition of substituted alkenes and TsDAM (TosylDiAzoMethane). The salient features of this protocol include high efficiency, mild reaction conditions, greener solvent, metal-free reaction, scalability and broad substrate scope along with high
开发了一种有效的直接无金属多米诺骨牌方法,用于通过取代烯烃和 TsDAM(TosylDiAzoMethane)的 [3 + 2] 环加成合成各种 8-羟基-2,8-二氢茚并[2,1- c ]吡唑。该协议的显着特点包括高效、温和的反应条件、更环保的溶剂、无金属反应、可扩展性和广泛的底物范围以及高区域选择性和产量。