Convergent Routes to the [1, 3] Dioxolo [4, 5-j] phenanthridin-6 (5H)-one and 2, 3, 4, 4a-Tetrahydro [1, 3] dioxolo [4, 5-j] phenanthridin-6 (5H)-one Nuclei. Application …
MG Banwell, CJ Cowden
Index: Banwell, Martin G.; Cowden, Cameron J. Australian Journal of Chemistry, 1994 , vol. 47, # 12 p. 2235 - 2254
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Citation Number: 34
Abstract
Abstract Convergent routes to the title nuclei,(1) and (6), have been developed. Thus, Suzuki coupling of boronic acid (8) with aryl bromide (9) gave the biarylylcarbamate (7) which, on treatment with phosphorus oxychloride (POCl 3), underwent Bischler-Napieralski cyclization to give, after acid hydrolysis, the Amaryllidaceae alkaloid crinasiadine (1). The cyclization reaction proceeds via an intermediate chlorophenanthridine (11) which can be isolated ...
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