[EN] SYNTHESIS OF OLEFINIC ALCOHOLS VIA ENZYMATIC TERMINAL HYDROXYLATION [FR] SYNTHÈSE D'ALCOOLS OLÉFINIQUES PAR L'INTERMÉDIAIRE DE L'HYDROXYLATION TERMINALE ENZYMATIQUE
DEFLUORINATIVE COUPLING REACTIONS OF<i>gem</i>-DIFLUOROOLEFINS WITH ORGANOLITHIUM REAGENTS. NOVEL, FACILE METHODS FOR CHAIN ELONGATIONS OF ALDEHYDES LEADING TO AMIDES, ACETYLENES, AND KETONES
作者:Sei-ichi Hayashi、Takeshi Nakai、Nobuo Ishikawa
DOI:10.1246/cl.1980.935
日期:1980.8.5
Three types of coupling reactions of gem-difluoroolefins derived easily from aldehydes with lithium reagents (R′Li and R′2NLi) are described which constitute the facile procedures for conversions of aldehydes (RCHO) to amides (RCH2CONR′2), acetylenes (R–C≡C–R′), and ketones (RCH2COR′).
Preparation and reaction of new dialkylzincs obtained by a boron-zinc transmetalation.
作者:Falk Langer、Jack Waas、Paul Knochel
DOI:10.1016/s0040-4039(00)73968-2
日期:1993.8
Various aliphatic organoboron derivatives were transmetalated to the corresponding dialkylzincs using diethyl- or dimethyl-zinc. This allows an access to zinc reagents not readily available by standard methods. Didecylzinc obtained by this method adds with good enantioselectivity (83 % ee) to PhCHO in the presence of catalytic amounts of (1R, 2R)-1,2-bis-(trifluorosulfonamido)cyclohexane.
Alkylation of 1-alkynes in THF
作者:Matthew Buck、J.Michael Chong
DOI:10.1016/s0040-4039(01)01131-5
日期:2001.8
Alkynes may be easily alkylated by sequential treatment with n-BuLi followed by an alkyl halide in THF. Primary iodides give excellent yields (75-99%) as do bromides in the presence of catalytic amounts of Bu4NI or NaI; in the absence of an iodide source, bromides react poorly. This method offers advantages over existing methods which use HMPA or NH3 as co-solvents. (C) 2001 Elsevier Science Ltd. All rights reserved.
Vinylic organoboranes. 5. An improved, convenient synthesis of unsymmetrical alkynes via iodination of lithium alkynyl ate complexes of thexylalkylborinates
作者:James A. Sikorski、N. G. Bhat、Thomas E. Cole、Kung K. Wang、Herbert C. Brown