Enantioselective Synthesis and Cross-Coupling of Tertiary Propargylic Boronic Esters Using Lithiation-Borylation of Propargylic Carbamates
作者:Benjamin M. Partridge、Laëtitia Chausset-Boissarie、Matthew Burns、Alexander P. Pulis、Varinder K. Aggarwal
DOI:10.1002/anie.201203198
日期:2012.11.19
Lithiation–borylation of propargyliccarbamates leads to tertiarypropargylicboronicesters in very high e.r., provided that ethylene glycol boronicesters are used. These versatile intermediates undergo a range of highly stereoselective transformations, including protodeboronation to give tertiary allenes and Suzuki–Miyaura cross‐couplings of tertiaryboron species leading to tetrasubstituted allenes
Enantioselective and regioselective nickel-catalyzed multicomponent coupling of chiral allenes, aromatic aldehydes, and silanes
作者:Sze-Sze Ng、Timothy F. Jamison
DOI:10.1016/j.tet.2005.08.063
日期:2005.11
developed, nickel-catalyzed multicomponent coupling of chiral allenes, aromatic aldehydes, and silanes is described. The axial chirality of the allene is transferred completely to the product, a trisubstituted Z-allylic alcohol protected as a silyl ether. A very high preference for sp rather than sp2 coupling is observed, and differentially substituted allenes undergo highly site-selective coupling. These
Kinetic Resolution of Propargylic Alcohols Catalyzed by Benzotetramisole
作者:Vladimir B. Birman、Lei Guo
DOI:10.1021/ol061906y
日期:2006.10.1
[reaction: see text] Kineticresolution of variously substituted secondary propargylic alcoholscatalyzed by benzotetramisole (BTM) proceeds with selectivity factors up to 32, the highest ever achieved with nonenzymatic catalysts for this class of substrates.
Compounds of formula I:
or salts thereof are disclosed. Also disclosed are pharmaceutical compositions comprising a compound of formula I, processes for preparing compounds of formula I, intermediates useful for preparing compounds of formula I and therapeutic methods for treating a Retroviridae viral infection including an infection caused by the HIV virus.
Asymmetric Synthesis of Trisubstituted Allenes: Copper-Catalyzed Alkylation and Arylation of Propargylic Phosphates
作者:Mycah R. Uehling、Samuel T. Marionni、Gojko Lalic
DOI:10.1021/ol2031119
日期:2012.1.6
Asymmetric synthesis of trisubstituted allenes is accomplished by copper-catalyzed alkylation and arylation of propargylic phosphates using organoboron nucleophiles. Excellent chirality transfer and regioselectivity, together with good functional group compatibility, were observed in reactions with both alkyl boranes and arylboronic esters.