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2005
Organo-boron compounds
S 0040
Preparation of 5-Hydroxy-1-alkenylboronates from 1-Alkynylboronates,
2ZrCl2/2EtMgBr, and Aldehydes. — The title compounds are prepared in moder10- 170 Cp
ate to good yields via hydrolysis of intermediate seven-membered zirconacycles. The
reaction is general for aliphatic and aromatic aldehydes. The ethylation products (V)
and (VIII) of the 1-alkynylboronates, which are obtained when the reaction is carried
out in the absence of the aldehyde, are always formed as by-product. — (QUNTAR,
A. A. A.; SREBNIK*, M.; Org. Lett. 6 (2004) 23, 4243-4244; Dep. Nat. Prod., Med.
Fac., Hebrew Univ., Jerusalem 91120, Israel; Eng.) — Steudel
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