Lithium Bis-(diisopropylamino)boracetylide [LiCCB(NiPr2)2]. A new reagent for the preparation of terminal alkynes
摘要:
Terminal alkynes RC=CH [R = PhCO, PhCH2OCO, (CH3)(2)CHCH2OCO. Et2NCO. (EtO)(2)P(O), PhCH2, H2C=CH-CH2, and Ph-CH(OH)-] may be prepared in satisfactory yield in a one-pot process by reaction in THF at -78 degrees C of the titled reagent with electrophiles followed by acidic workup with dilute HCl. (C) 1997 Elsevier Science Ltd.
The photomediated reaction of alkynes with cycloalkanes
作者:Roísín A. Doohan、John J. Hannan、Niall W. A. Geraghty
DOI:10.1039/b517631j
日期:——
of a photomediator such as benzophenone, alkynes with electron-withdrawing groups react with cycloalkanes to give vinyl cycloalkanes. The reaction involves the regiospecific addition of a photochemically generated cycloalkyl radical to the beta-carbon of the alkyne. The stereochemical outcome of the reaction depends on the nature of the photomediator and alkyne used.
[EN] PROCESS FOR OBTAINING 17-SPIROLACTONES IN STEROIDS<br/>[FR] PROCÉDÉ D'OBTENTION DE 17-SPIROLACTONES DANS DES STÉROÏDES
申请人:CRYSTAL PHARMA S A
公开号:WO2010146042A1
公开(公告)日:2010-12-23
The invention relates to processes for obtaining steroids with a spirolactone group in position 17, particularly to industrially obtaining 6β,7β; 15β,16β-dimethylene-3-oxo-17α- pregn-4-ene-21,17-carbolactone, commonly known as Drospirenone, as well as to intermediates useful in said process.
highly stereo- and regioselective hydrophosphorylation of terminalalkynes to E-alkenylphosphorus compounds was well developed. It represents a general and practical hydrophosphorylation method, of which diarylphosphine oxide, dialkylphosphine oxide and dialkyl phosphite all had effective P(O)H parts to react with different types of terminalalkynes. Contrary to previous air-sensitive reports, all the reactions
A copper-catalyzed [4+2] cyclization reaction of isoquinolines and alkynes is developed for the one-step construction of isoquinolinone derivatives with multisubstituted bridging rings. The unique feature of this three-component tandem cyclization reaction is the functionalization of the C1, N2, C3, and C4 positions of 3-haloisoquinolines via the construction of new C–N, C═O, and C–C bonds. This dearomatization