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200517.fm Page 124 Friday, March 18, 2005 2:52 PM
2005
Benzofuran derivatives
R 0070
Complementary Diastereoselective Reduction of Cyclic γ-Keto Acids: Efficient
to Trisubstituted γ-Lactones. — The title reactions are developed to afford
17- 114 Access
each diastereomer of the title compounds. Conditions A) which use a trialkylborohydride afford the syn/anti lactones as the major products. Conditions B) which include
a silane reagent and TFA give mainly the all syn products. — (BERCOT, E. A.;
KINDRACHUK, D. E.; ROVIS*, T.; Org. Lett. 7 (2005) 1, 107-110; Dep. Chem.,
Colo. State Univ., Fort Collins, CO 80523, USA; Eng.) — Steudel
200517.fm Page 125 Friday, March 18, 2005 2:52 PM
2005
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