136088-19-2Relevant articles and documents
Enantiospecific Synthesis with Amino Acids. Part 1. Tryptophan as a Chiron for the Synthesis of α-Substituted Tryptophan Derivatives
Bourne, Gregory T.,Crich, David,Davies, John W.,Horwell, David C.
, p. 1693 - 1699 (2007/10/02)
Nα-Methoxycarbonyl-(S)-tryptophan methyl ester is cyclised with 85percent phosphoric acid to give (2S,3aR,8aS)-1,2-bis(methoxycarbonyl)-1,2,3,3a,8,8a-hexahydropyrroloindole which on reaction with toluene-p-sulphonyl chloride gives (2S,3a