N–H Insertion reactions of rhodium carbenoids. Part 3.1 The development of a modified Bischler indole synthesis and a new protecting-group strategy for indoles
[EN] 4-AMINO-7,8-DIHYDROPYRIDO[4,3-D]PYRIMIDIN-5(6H)-ONE DERIVATIVES<br/>[FR] DÉRIVÉS DE 4-AMINO-7,8-DIHYDROPYRIDO[4,3-D]PYRIMIDIN-5(6H)-ONE
申请人:PFIZER
公开号:WO2010089686A1
公开(公告)日:2010-08-12
The invention provides compounds of the general Formula (I) where R1, R2, and A are defined herein, as well as the preparation, compositions and uses thereof.
The invention provides compounds of the general Formula (I)
where R
1
, R
2
, and A are defined herein, as well as the preparation, compositions and uses thereof.
这项发明提供了一般式(I)的化合物
其中R1、R2和A在此处定义,以及其制备、组成和用途。
N–H Insertion reactions of rhodium carbenoids. Part 3.1 The development of a modified Bischler indole synthesis and a new protecting-group strategy for indoles
作者:Katherine E. Bashford、Anthony L. Cooper、Peter D. Kane、Christopher J. Moody、Sendogagounder Muthusamy、Elizabeth Swann
DOI:10.1039/b202666j
日期:2002.7.11
A modified version of the Bischler indole synthesis has been developed in which the key step is the NâH insertion reaction of rhodium carbene intermediates derived from α-diazo-β-ketoesters with anilines. Thus N-methylanilines 1 react with diazoketoesters 2 in the presence of dirhodium(II) acetate to give (N-arylamino)ketones 3, cyclisation of which using boron trifluorideâethyl acetate or acidic ion exchange resin gives the indoles 4. In order to extend this method to the synthesis of N-unsubstituted indoles, a new protecting group strategy for indoles was developed. In this, anilines are reacted with α,β-unsaturated-esters or -sulfones to give the conjugate addition products 6 and 9,
cyclisation of which gives indoles 8 and 11. The N-(2-ethoxycarbonylethyl)- and -(2-sulfonylethyl)- protecting groups are readily removed from indoles 8 and 11 by treatment with base.