Synthesis of constrained phenylalanine derivatives via a [2+2+2] cycloaddition strategy
作者:Sambasivarao Kotha、Enugurthi Brahmachary
DOI:10.1016/s0968-0896(02)00039-1
日期:2002.7
A simple synthesis of dialkyne building blocks (6,7,8 and 9) embodying amino acid moiety is described. The dialkyne 6 participated in a [2 + 2+ 2] cycloaddition reaction with various monoalkynes in presence of Wilkinson's catalyst to give 5- and 5,6-disubstitued indan-based alpha-amino acid derivates. Cobalt catalyst [e.g., CpCo(CO)(2)] has also been employed in the synthesis of various 2-indanyl glycine derivatives via co-trimerization reaction of the diyne building blocks 6 and 7 with several monoalkynes. (C) 2002 Elsevier Science Ltd. All rights reserved.