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200517.fm Page 80 Friday, March 18, 2005 2:52 PM
2005
Cyclopropane derivatives
Q 0021
Facile and Environmentally Benign Zn-Mediated Cyclopropanation of Elec2-Iodoethyl-Substituted Olefins via Radical 3-exo-trig Manner. —
17- 077 tron-Deficient
The cyclization of 2-iodoethyl-substituted olefins in the presence of zinc proceeds with
good yields for substrates bearing an ester, amide, sulfone, and nitro group at the olefinic double bond, and dialkyl groups either at the 4- or 5-position as in compounds
(I), (III), and (V). In contrast, olefins (X) react with significantly less efficiency. —
(SAKUMA, D.; TOGO*, H.; Synlett 2004, 14, 2501-2504; Grad. Sch. Sci. Technol.,
Chiba Univ., Inage, Chiba 263, Japan; Eng.) — Klein
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