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200517.fm Page 41 Friday, March 18, 2005 2:52 PM
2005
Ring closure reactions
O 0130
Cyclization of 1-Bromo-2,7- and 1-Bromo-2,8-enynes Mediated by Indium. —
title reactions afford five- and six-membered compounds in good yields. The
17- 041 The
attempt to synthesize the seven-membered cycles in a similar manner failed so far.
KI is a suitable additive in the cyclization of terminal 1-bromo-2,7-enynes. The preparation of six-membered products also proceeds without KI but at higher temperatures.
The same is valid for the reactions of internal alkynes. — (LEE*, P. H.; KIM, S.; LEE,
K.; SEOMOON, D.; KIM, H.; LEE, S.; KIM, M.; HAN, M.; NOH, K.;
LIVINGHOUSE, T.; Org. Lett. 6 (2004) 26, 4825-4828; Dep. Chem., Kangwon Natl.
Univ., Chunchon 200-701, S. Korea; Eng.) — Steudel
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