Photolysis of N-chloroacetyl-3,4-dimethoxy-phenylpropylamine (1) gave the eight-membered lactam (2) and the novel aza-azulene derivatives (4 and 5); the nine-membered lactam (9) was synthesized similarly from N-chloroacetyl-3,4-dimethoxyphenylbutylamine (8).
Y. Okuno, K. Hemmi and O. Yonemitsu, J. Chem. Soc. D, 1971, 745 DOI: 10.1039/C29710000745
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