Expedient Synthesis of Chiral Homoallylamines via <i>N</i>,<i>O</i>-Acetal TMS Ethers and Its Application
作者:Young-Ger Suh、Jaebong Jang、Hwayoung Yun、Sae Mi Han、Dongyun Shin、Jae-Kyung Jung、Jong-Wha Jung
DOI:10.1021/ol202573s
日期:2011.11.4
A highlystereoselective and efficient method for the synthesis of optically active homoallylamines was developed. Key features of the method include (1) the utilization of naphthylethylamine as both an excellent chiral auxiliary and the amine source, (2) the 1,3-chiral induction of the N-acyliminium ion with high stereoselectivity and high yield, and (3) facile auxiliary removal under mild conditions
Enantioselective Markovnikov Addition of Carbamates to Allylic Alcohols for the Construction of α-Secondary and α-Tertiary Amines
作者:Ana Bahamonde、Buthainah Al Rifaie、Victor Martín-Heras、Jamie R. Allen、Matthew S. Sigman
DOI:10.1021/jacs.9b03438
日期:2019.6.5
Herein we describe the development of a Pd-catalyzed enantioselective Markovnikov addition of carbamates to allylic alcohols for the construction of α-tertiary and α-secondary amines. The reaction affords a range of β-amino alcohols, after reduction of the aldehyde in situ, which contain a variety of functional groups in moderate yields and moderate to good enantioselectivities. These products can
Stereoselective Formation of <i>N</i>-Acyliminium Ion via Chiral <i>N</i>,<i>O</i>-Acetal TMS Ether and Its Application to the Synthesis of <i>β</i>-Amino Acids
see text] The highlystereoselectivesynthesis of beta-amino acids via the chiral 4-phenyloxazolidinone-controlled linear N-acyliminium ion reaction has been achieved by employing chiral N,O-acetal TMS ethers. In addition, the mechanism of the excellent stereochemical outcome has been elucidated. The oxazolidinone auxiliary plays a dual role in stereocontrol: the E/Z geometry control of the N-acyliminium
Effective Methods for the Synthesis ofN-Methylβ-Amino Acids from All Twenty Commonα-Amino Acids Using 1,3-Oxazolidin-5-ones and 1,3-Oxazinan-6-ones
作者:Andrew B. Hughes、Brad E. Sleebs
DOI:10.1002/hlca.200690235
日期:2006.11
N-Methyl β-amino acids are generally required for application in the synthesis of potentially bioactive modified peptides and other oligomers. Previous work highlighted the reductive cleavage of 1,3-oxazolidin-5-ones to synthesise N-methyl α-amino acids. Starting from α-amino acids, two approaches were used to prepare the corresponding N-methyl β-amino acids. First, α-amino acids were converted to