Enantioselective Synthesis of Cyclopentene Carbaldehydes by a Direct Multicatalytic Cascade Sequence: Carbocyclization of Aldehydes with Alkynes
作者:Kim L. Jensen、Patrick T. Franke、Carlos Arróniz、Sara Kobbelgaard、Karl Anker Jørgensen
DOI:10.1002/chem.200903405
日期:2010.2.8
A multicatalytic, asymmetric cascade reaction sequence of α,β‐unsaturated aldehydes with alkyne‐tethered nucleophiles has been developed. Organocatalytic iminium–enamine catalysis combined with Lewis acid alkyne activation gave cyclopentene carbaldehyde products in good yields and excellent stereoselectivities (see scheme). To highlight the potential of the sequence, a key structure for the preparation
已经开发出α,β-不饱和醛与炔烃系链亲核试剂的多催化,不对称级联反应序列。有机催化的亚胺基-烯胺催化与路易斯酸炔烃的活化相结合,可得到具有良好收率和出色立体选择性的环戊烯甲醛产品(参见方案)。为了突出该序列的潜力,合成了用于制备氟烷十一烷二萜类似物的关键结构。