Asymmetric Synthesis of β-Amino Carbonyl Compounds with <i>N</i>-Sulfinyl β-Amino Weinreb Amides
作者:Franklin A. Davis、M. Brad Nolt、Yongzhong Wu、Kavirayani R. Prasad、Danyang Li、Bin Yang、Kerisha Bowen、Seung H. Lee、John H. Eardley
DOI:10.1021/jo0402780
日期:2005.3.1
readily add to enantiopure N-sulfinyl β-aminoWeinrebamides providing the corresponding, stable, N-sulfinyl β-amino carbonyl compounds in good to excellent yields. This new methodology represents a general solution to the problem of β-amino carbonyl syntheses, which are important chiral building blocks and constituents of natural products. N-Sulfinyl β-aminoWeinrebamides are prepared by reaction of the
Asymmetric Synthesis of α-Substituted β-Amino Ketones from Sulfinimines (<i>N</i>-Sulfinyl Imines). Synthesis of the Indolizidine Alkaloid (−)-223A
作者:Franklin A. Davis、Bin Yang
DOI:10.1021/ja051452k
日期:2005.6.1
carbonyl-LiN(TMS)(2) moiety destabilize the transition state leading to the Z-enolate in the poorly coordinating diethyl ether solvent. This new synthesis of syn-alpha-substituted-beta-amino ketones was applied to the concise enantioselective totalsynthesis of indolizidine (-)-223A, a 5,6,8-trisubstituted alkaloid isolated from the skin of the dendrobatide frog.
The use of enantiomerically pure N-sulfinimines in asymmetric Baylis–Hillman reactions
作者:Varinder K. Aggarwal、Ana M.Martin Castro、Andrea Mereu、Harry Adams
DOI:10.1016/s0040-4039(02)00021-7
日期:2002.2
The electrophilic behaviour of enantiomerically pure N-p-toluenesulfinimines (1a–d) and N-tert-butanesulfinimine 2 has been tested in the asymmetricBaylis–Hillmanreaction with methyl acrylate with and without Lewis acids. In the presence of In(OTf)3 good yields and high diastereoselectivities have been achieved providing an effective route to β-amino-α-methylene esters.
的对映体纯的电行为ñ - p -toluenesulfinimines(1A - d)和ñ -叔-butanesulfinimine 2已与丙烯酸甲酯与不路易斯酸不对称的Baylis-Hillman反应进行了测试。在In(OTf)3的存在下,已经获得了良好的收率和高的非对映选择性,提供了通往β-氨基-α-亚甲基酯的有效途径。
Asymmetric strecker synthesis using enantiopure sulfinimines: A convenient synthesis of α-amino acids
作者:Franklin A. Davis、Rajarathnam E. Reddy、Padma S. Portonovo
DOI:10.1016/s0040-4039(00)78540-6
日期:1994.12
Diethylaluminum cyanide adds stereoselectively to enantiopure sulfinimines 1 and 2 to give diastereomerically enriched α-amino nitriles 3 and 4 which are hydrolyzed in one step to α-amino acids 5 in >95% ee and good yields.
Asymmetric Thio-Michael/Nucleophilic Addition Domino Reaction with Chiral <i>N</i>-Sulfinimines
作者:Akio Kamimura、Hidenori Okawa、Yuki Morisaki、Shingo Ishikawa、Hidemitsu Uno
DOI:10.1021/jo062251h
日期:2007.4.1
active N-sulfinimines underwent stereoselective Michael/nucleophilicaddition domino reaction triggered by magnesium thiolate to give α-phenylthiomethyl-β-(N-sulfinylamino) esters in high diastereomeric excess. The adducts were readily converted into optically active α-methylene-β-(N-sulfinylamino)esters so that this reaction provides a useful asymmetric aza-Baylis−Hillman-equivalent method.