Catalytic Asymmetric Synthesis of Alkynyl Aziridines: Both Enantiomers of
<i>cis</i>
‐Aziridines from One Enantiomer of the Catalyst
作者:Yong Guan、Maria P. López‐Alberca、Zhenjie Lu、Yu Zhang、Aman A. Desai、Aniruddha P. Patwardhan、Yijing Dai、Mathew J. Vetticatt、William D. Wulff
DOI:10.1002/chem.201404587
日期:2014.10.20
inductions mediated by a chiral boroxinate or BOROX catalyst. In contrast to the AZ reaction with aryl‐ and alkyl‐substituted imines, alkynyl imines react to give cis‐substituted aziridines with both diazo esters and diazo acetamides. Remarkably, however, the two diazo compounds give different enantiomers of the cis‐aziridine from the same enantiomer of the catalyst. Theoretical considerations of the possible
Synthesis of (±)-muscopyridine analogue was accomplished via the bicyclo-2-pyridone as a key intermediate, which was synthesized using ring-expansion reaction of the cyclicβ-keto methyl ester with the alkynyl imine. The bicyclo-2-pyridone was transformed into the (±)-muscopyridine analogue in the following four steps in high yields: deprotection, pyridine formation, methylation, and hydrogenation
Diastereoselective and Enantiospecific Synthesis of 1,3-Diamines via 2-Azaallyl Anion Benzylic Ring-Opening of Aziridines
作者:Kangnan Li、Alexandria E. Weber、Luke Tseng、Steven J. Malcolmson
DOI:10.1021/acs.orglett.7b01886
日期:2017.8.18
Herein, we demonstrate a stereocontrolled synthesis of 1,3-diamines, which bear up to three contiguous stereogenic centers, through benzylic ring-opening of aziridines with 2-azaallyl anion nucleophiles. Reactions proceed efficiently (yield up to 95%), diastereoselectively (dr up to >20:1), site selectively, and enantiospecifically to deliver products with differentiated amino groups.