- New Azetidinone Building Block for Carbapenems
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A new versatile building block for the synthesis of carbapenems, (3S,4R)-3-{(R)-1-[tert-butyl-(dimethyl)silyloxy]ethyl}-4-[(2RS)-5-(4-methoxybenzyloxy)pent-3-yn-2-yl]azetidin-2-one, has been obtained by zinc-promoted alkylation of (3R,4R)-(+)-3-{(R)-1-[te
- Khasanova,Valiullina,Galeeva,Egorov,Gimalova
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- Wittig Rearrangement of Nonracemic Propargyl Ethers Leading to Allenes of High Stereochemical Integrity
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The (R)-propargylic tributylstannylmethyl and glycolic acid ethers 4a, 4b, 5a and 5b rerrange to the (R)-allenylcarbinols 6a, 6b, 7a, and 7b of high ee upon treatment with n-BuLi or LDA, respectively, at low temperature.
- Marshall, James A.,Robinson, Edward D.,Zapata, Antonio
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p. 5854 - 5855
(2007/10/02)
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