Copper(II)- and Palladium(II)-Catalyzed Enantioselective Claisen Rearrangement of Allyloxy- and Propargyloxy-Indoles to Quaternary Oxindoles and Spirocyclic Lactones
作者:Trung Cao、Elizabeth C. Linton、Joshua Deitch、Simon Berritt、Marisa C. Kozlowski
DOI:10.1021/jo302039n
日期:2012.12.21
In this Article, a strategy to obtain highly enantio-selective catalysts for the Claisen rearrangement of allyloxy- and propargyloxy-indoles is outlined. Ultimately, copper BOX and palladium BINAP or PHOX catalysts were discovered as superior in catalyzing Claisen rearrangements of allyloxy- or proparyloxy-substituted indoles to generate oxindoles bearing allyl- or allenyl-substituted quaternary centers. This method proved to be tolerant of a broad range of functional groups. Tandem reactions of the silyl-allene products provide rapid access to a variety of spirocyclic oxindoles in one operation.
[EN] ASYMMETRIC SYNTHESIS OF ALLYL OR ALLENE OXINDOLES<br/>[FR] SYNTHÈSE ASYMÉTRIQUE D'OXINDOLES D'ALLYLE OU D'ALLÈNE
申请人:UNIV PENNSYLVANIA
公开号:WO2010008727A1
公开(公告)日:2010-01-21
The invention concerns processes for the preparation of a compound of the formula I comprising contacting a compound of formula II with a catalyst, said catalyst comprises (i) at least one of Pd and Cu and (ii) one or more of diamine, diphosphine and aminophosphine ligands; wherein Z is -C(R5)(R6)-C(R2)=C(R3)(R4) and Y is -C(R3)(R4)-C(R2)=C(R5)(R6) or Z is -C(R5)(R6)-C≡C-R3; Y is or -C(R3)=C=C(R5)(R6); X is NH, NR15, O or S; a is O or an integer from 1 to 4 and R1 -R7 and R15 are as defined in the specification.