An approach to the isoschizozygane alkaloid core using a 1,4-dipolar cycloaddition of a cross-conjugated heteroaromatic betaine.
[reaction: see text] A new strategy for the synthesis of the isoschizozygane alkaloid core has been developed that is based on a 1,4-dipolar cycloaddition reaction of a cross-conjugated heteroaromatic betaine. The resulting cycloadduct undergoes loss of COS, and further reduction delivers a 5a-aza-acenaphthylene intermediate that was transformed into the isoschizozygane skeleton upon treatment with acid.
Padwa
Albert
A
Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA. chemap@emory.edu
Flick
Andrew C
AC
Lee
Hyoung Ik
HI
D001622:Betaine / Q000737:chemistry*; D003500:Cyclization; D026121:Indole Alkaloids / Q000138:chemical synthesis* / Q000737:chemistry; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry; D013237:Stereoisomerism
D026121:Indole Alkaloids; C509580:schizozygine; D001622:Betaine