Conjugate addition of allylsilanes to α,β-unsaturated N-acyloxazolidinones
作者:Ming-Jung Wu、Jiann-Yih Yeh
DOI:10.1016/s0040-4020(01)80818-8
日期:1994.1
The conjugate addition of allyltrimethylsilane to alpha,beta-unsaturated N-acyloxazolidinone at -78 degrees C in the presence of TiCl4 gave the allylation product 3. However, when the reaction was carded out at room temperature, a small amount of cyclopentane adduct 4 was observed. The cyclopentane product formation can be prevented by employing BF3.OEt(2) as a Lewis acid. The enantioselective synthesis of optically pure 3-substituted-5-hexenoic acids was achieved by employing chiral oxazolidinone as a chiral auxiliary.
Fluorine in fragrances: exploring the difluoromethylene (CF<sub>2</sub>) group as a conformational constraint in macrocyclic musk lactones
作者:Michael J. Corr、Rodrigo A. Cormanich、Cortney N. von Hahmann、Michael Bühl、David B. Cordes、Alexandra M. Z. Slawin、David O'Hagan
DOI:10.1039/c5ob02023a
日期:——
The synthesis of a series of selectively fluorinated musk lactones is reported with CF2 groups at various locations to bias conformation the ring.