Tetrahedron Letters p. 3619 - 3620 (1982)
Update date:2022-08-03
Topics:
Kessar, S. V.
Gupta, Y. P.
Singh, T. V.
Sood, A.
Nanda, A. K.
Agnihotri, K. R.
Photolysis of N-deuteriomethyl dihydroberberine salt (1b) gave 1-o-toluyl-3,4-dihydroisoquinoline (5b) with a deuterium atom incorporation; a mechanism involving a 1,7-hydrogen shift step is proposed.The keto-imine (5a) on irradiation followed by reduction furnished 11,12-dimethoxy tetrahydroberberine (9a).
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