Enantioselective Organocatalytic Indole Alkylations. Design of a New and Highly Effective Chiral Amine for Iminium Catalysis
作者:Joel F. Austin、David W. C. MacMillan
DOI:10.1021/ja017255c
日期:2002.2.1
"privileged" structure with representation in over 3000 natural isolates and 40 medicinal agents of diverse therapeutic action. A newstrategy for asymmetric access to this important pharmacaphore has been accomplished that involves the amine catalyzed alkylation of indoles with alpha,beta-unsaturated aldehydes. Central to these studies has been the design of a newchiral amine catalyst that exhibits
A Simple and Broadly Applicable C−N Bond Forming Dearomatization Protocol Enabled by Bifunctional Amino Reagents
作者:Xiaofeng Ma、Joshua J. Farndon、Tom A. Young、Natalie Fey、John F. Bower
DOI:10.1002/anie.201708176
日期:2017.11.13
A C-Nbondformingdearomatizationprotocol with broad scope is outlined. Specifically, bifunctionalaminoreagents are used for sequential nucleophilic and electrophilic C-Nbond formations, with the latter effecting the key dearomatization step. Using this approach, γ-arylated alcohols are converted to a wide range of differentially protected spirocyclic pyrrolidines in just two or three steps.
A compound of Formula I and the pharmaceutically acceptable acid addition salts thereof,
wherein
R1 and R2 are independently selected from lower, meaning C1-4, alkyl or hydrogen;
R3, R4, R8 and R9 are independently selected from hydrogen, lower alkyl, lower alkoxy, carbamide, halogen, trifluoromethyl and thio-lower alkyl, with the proviso that R8 and R9 cannot both be hydrogen at the same time;
A is a Cs-7 cycloalkanyl or cycloalkenyl ring, or
A is
wherein n is an integer from 1 to 3 and R5 is the same as R1; and
R6 and R7 are independently selected from hydrogen, methyl or R6 and R7 can be taken together as a methylene bridge, useful as antidepressants.