Convenient synthesis of 3,4-methano-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid and its derivatives as doubly constrained nonproteinogenic aminoacid derivatives

Three strategies for the synthesis of the novel, doubly constrained, 3,4-me thano-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid and its derivatives were evaluated. Only cyclocondensation of the mono(triphenyl)phosphonium sa lt derived from 1,2-bis(bromomethyl)benzene with N-alkoxycarbonyloxamates i n 1,2-dimethoxyethane in the presence of potassium carbonate and subsequent cyclopropanation with dimethylsulfoxonium methylide in dimethyl sulfoxide furnished suitable O-and N-protected derivatives of 3,4-methano-1,2,3,4-tet rahydroisoquinoline-3-carboxylic acid in a convenient way. A detailed 2D DQ F-COSY and 2D NOESY NMR analysis of the rotational. isomerism of the latter bicyclic amino acid derivatives was performed. Various O- and N-protection protocols were worked out to afford access to a whole range of new derivat ives of the title amino acid, suitable for peptide synthesis.