A facile synthesis of chiral ω-allyl- and ω-n-propyllactones via asymmetric allylboration of formyl esters with B-allyldiisopinocampheylborane
摘要:
Asymmetric allylboration of aldehydes containing an adjacent ester group with B-allyldiisopinocampheylborane, followed by hydrolysis and cyclization, provides the corresponding allyl substituted lactones in high yields and greater than or equal to 92% enantiomeric excess. Hydrogenation of these lactones provides the corresponding propyl substituted lactones without any loss of optical purity. (C) 1999 Elsevier Science Ltd. All rights reserved.
Stereoselective allylation of aldehydes on solid support and its application in biology-oriented synthesis (BIOS)
作者:Victor Mamane、Ana B. García、Jayant D. Umarye、Torben Lessmann、Stefan Sommer、Herbert Waldmann
DOI:10.1016/j.tet.2007.01.041
日期:2007.6
allylation of aldehydes on solid support is reported. Different kinds of chiral allylboron reagents with complementary direction of stereoinduction were applied successfully in this reagent-controlled transformation. The homoallylic alcohol products are generated with high levels of stereoselectivity and in high yields. The crotylation of aldehydes on solid support employing (E)- and (Z)-Ipc2crotylborane
A facile synthesis of chiral ω-allyl- and ω-n-propyllactones via asymmetric allylboration of formyl esters with B-allyldiisopinocampheylborane
作者:P.Veeraraghavan Ramachandran、Marek P. Krzeminski、M.Venkat Ram Reddy†、Herbert C. Brown
DOI:10.1016/s0957-4166(98)00477-7
日期:1999.1
Asymmetric allylboration of aldehydes containing an adjacent ester group with B-allyldiisopinocampheylborane, followed by hydrolysis and cyclization, provides the corresponding allyl substituted lactones in high yields and greater than or equal to 92% enantiomeric excess. Hydrogenation of these lactones provides the corresponding propyl substituted lactones without any loss of optical purity. (C) 1999 Elsevier Science Ltd. All rights reserved.
Palladium-Catalyzed Asymmetric Synthesis of 2-Alkynyl Oxacycles
作者:David S. B. Daniels、Amber L. Thompson、Edward A. Anderson
DOI:10.1002/anie.201105720
日期:2011.11.25
cyclizations of cyclic and acyclic propargylic carbonates give 2‐alkynyl oxacycles. The reactions proceed with very high stereoselectivity for both syn‐ and anti‐disubstituted furans and pyrans, and with exceptional regioselectivity. In addition, two‐directional cyclizations of bis‐propargylic carbonate substrates yield bifurans with complete stereocontrol for all diastereomers.