A concise enantioselective synthesis of (R)-selegiline, (S)-benzphetamine and formal synthesis of (R)-sitagliptin via electrophilic azidation of chiral imide enolates
作者:Soumen Dey、Arumugam Sudalai
DOI:10.1016/j.tetasy.2014.11.014
日期:2015.1
(S)-sitagliptin, an anti-diabetic drug has been described starting from commercially available starting materials employing Evans’ electrophilic azidation of chiralimideenolates as a key chiral inducing step, which proceeds in a highly diastereoselective manner (>99%).
Pd-catalyzed reductive cleavage of NN bond in dibenzyl-1-alkylhydrazine-1,2-dicarboxylates with PMHS: application to a formal enantioselective synthesis of (R)-sitagliptin
作者:Soumen Dey、Sunita K. Gadakh、Brij Bhushan Ahuja、Sanjay P. Kamble、Arumugam Sudalai
DOI:10.1016/j.tetlet.2015.12.116
日期:2016.2
An environmentally benign approach involving Pd-catalyzed reductive N-N bond cleavage in dibenzyl-1-alkylhydrazine-1,2-dicarboxylates leading to the synthesis of N-(tert-butoxy)carbamates under very mild conditions has been described. PMHS serves as an inexpensive source of hydride in MeOH/deionized H2O medium. This protocol has been successfully applied in the formal synthesis of (R)-sitagliptin, an anti-diabetic drug. (C) 2015 Elsevier Ltd. All rights reserved.