ITOMANINDOLES A AND B. METHYLSULFINYLINDOLES FROM LAURENCIA BRONGNIARTII
Optically active 2- and 3-methylsulfinylindoles 2 and 3 have been isolated from the red alga Laurencia brongniartii.The structure of 2, and hence 3 by comparison ,was determined by X-ray and revealed a pair of hydrogen-bonded molecules possessing a center of inversion.
Tanaka, Jun'ichi,Higa, Tatsuo,Bernardinelli, Gerald,Jefford, Charles W.
SULFUR-CONTAINING POLYBROMOINDOLES FROM THE RED ALGA LAURENCIA BRONGNIARTII
Six new polybromoindoles (9-14) have been isolated from the red alga Laurencia brongniartii.Two were optically active sulfoxides, the itomanindole A (12) and B (13) and one was a bisindole (14).The structures of 12 and 14 were elucidated by X-ray analysis.The sulfoxides 12 and 13 were readily converted with diazomethane to the corresponding N-methyl derivatives.Treatment with acetic anhydryde at room temperature gave the same indolenine (24) as the major product.
Tanaka, Jun'ichi,Higa, Tatsuo,Bernardinelli, Gerald,Jefford, Charles W.
p. 7301 - 7310
(2007/10/02)
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