The hydroperoxidation of various allylsilanes by singletoxygen has been studied. The regioselectivity of this reaction compared to those of ethyl azodicarboxylate and 4-phenyl-1,2,4-triazoline-3,5-dione, is discussed. Mechanisms are considered in the general field of the ene reaction applied to allylic organometallic Group IVB compounds. The structures of the new products (alcohols, urazoles, hydrazines)
The cis of 4-(trimethylsilyl)-3-butyn-2-ol with lithium aluminium hydride
作者:Michael L. Mancini、John F. Honek
DOI:10.1016/s0040-4039(00)88324-0
日期:1983.1
systematic study led to a method for the preparation of (Z)-4-(trimethylsilyl)-3-buten-2-ol (2) in at least 99% purity by the reduction of the alkyne 4-(trimethylsilyl)-3-butyn-2-ol (1) with lithiumaluminiumhydride (LAH) as a clear solvate in ether.
A new and highly stereocontrolled entry to terminal conjugated trienes is described which relies upon the diastereoselective [2,3]Wittig rearrangement of > (silyl)allylic propargyl ethers followed by Peterson olefination. The synthetic utility of this method is demonstrated by the stereocontrolled synthesis of sarohornene B and C (marine natural products).
Regioselective synthesis of highly functionalized alkenylboronates by Cu-catalyzed borylation of propargylic silylalkynes
作者:Yeong Eun Kim、DingXi Li、Jaesook Yun
DOI:10.1039/c5dt00144g
日期:——
Highregioselectivity was achieved in the Cu(I)-catalyzed borylation of internal propargylic alkynes with a silyl substituent to afford multifunctionalized alkenylboron compounds. While both the silyl and propargylic substituents are known to act as directing groups, a N-heterocyclic carbene (NHC)–Cu complex furnished β-vinylboronate products (relative to Si) with high selectivity.
Stereoselective introduction of chiral centres in acyclic precursors : a probe into the transition state of m-chloroperbenzoic (m-CPBA) acid epoxidation of acyclic allylic alcohols and its synthetic implications
作者:Acharan S. Narula
DOI:10.1016/s0040-4039(00)87885-5
日期:——
The magnitude of A(1,3)-interaction far exceeds that of A(1,2)-interaction in the transition state for the organic per-acid epoxidation of acyclic allylic alcohols.