Citation:
Ye WANG, Zhan Zhu LIU, Shi Zhi CHEN, Xiao Tian LIANG. Asymmetric Pictet-Spengler Reactions: Synthesis of Tetrahydroisoquinoline Derivatives from L-DOPA[J]. Chinese Chemical Letters,
;2004, 15(5): 505-507.
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The cis-1-substituted-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid esters 3 can be obtained in a highly diastereoselective fashion through 1,3-induction Pictet-Spengler (P-S) cyclization of the L-DOPA (3,4-dihydroxyphenylalanine) methyl ester with aromatic or aliphatic aldehydes under acidic conditions. Their epimers 4 are also obtained as minor products.
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