作者:Teruaki Mukaiyama、Nobuharu Iwasawa、Rodney W. Stevens、Toru Haga
DOI:10.1016/s0040-4020(01)82423-6
日期:1984.1
A highly diastereoselective cross aldolreaction is developed using divalent tin enolates formed from stannous trifluoromethanesulfonate and carbonyl compounds. The reaction is extended to a highly enantioselective cross aldolreaction employing chiral diamines derivedfrom (S)-proline as ligands.
The Partial Reduction of Carboxylic Acids to Aldehydes<i>via</i>3-Acylthiazolidine-2-thiones with Diisobutylaluminum Hydride and with Lithium Tri-<i>t</i>-butoxyaluminum Hydride
作者:Toshio Izawa、Teruaki Mukaiyama
DOI:10.1246/bcsj.52.555
日期:1979.2
carboxylic acids and readily available thiazolidine-2-thione, were reduced to the corresponding aldehydes either with diisobutylaluminum hydride in toluene at −78–−40 °C in 70–90% yields or with lithium tri-t-butoxyaluminum hydride in tetrahydrofuran at −20-0 °C in 80–90% yields. The present method appears to be applicable to the synthesis of aldehydes from both aromatic and aliphatic derivatives having
3-酰基噻唑烷-2-硫酮,很容易从羧酸和容易获得的噻唑烷-2-硫酮制备,在-78--40°C 的甲苯中用氢化二异丁基铝以 70-90% 的收率或用在四氢呋喃中在 -20-0 °C 下以 80-90% 的产率使用氢化锂三叔丁氧基铝。本方法似乎适用于从具有氯、溴、硝基和非共轭双键的芳香族和脂肪族衍生物合成醛,除了用三叔丁氧基氢化铝锂和氰基衍生物与氢化二异丁基铝的反应。反应混合物原来的黄色消失表明还原完成。
Ni(II) Tol-BINAP-Catalyzed Enantioselective Orthoester Alkylations of <i>N</i>-Acylthiazolidinethiones
作者:David A. Evans、Regan J. Thomson
DOI:10.1021/ja053386s
日期:2005.8.1
The development of a Ni(II) (S)-Tol-BINAP-catalyzed enantioselective alkylation of N-acylthiazolidinethiones with trimethyl orthoformate is described. The reaction is general with respect to the thiazolidinethione, providing the desired adducts in good to excellent yield and with high levels of enantioselectivity (11 examples, 51-92% yield, 90-99% ee). The products are readily converted into a variety of synthetically useful derivatives in a straightforward manner.
New highly regioselective reactions of unprotected sucrose. Synthesis of 2-O-acylsucroses and 2-O-(N-alkylcarbamoyl)sucroses
New methodologies which lead selectively to chosen regioisomeric mono-O-acylsucroses are described. The results indicate that a selective ionization of the free sugar makes the secondary 2-OH group of the glucose moiety more nucleophilic than the primary hydroxyls. New 2-O-acylsucroses 2 and 2-O-(N-alkylcarbamoyl)sucroses 3 were thus obtained in high yields.
YAMADA, M.;YAHIRO, S.;YAMANO, T.;NAKATANI, Y.;OURISSON, G., BULL. SOC. CHIM. FR.,(1990) N, C. 821-829
作者:YAMADA, M.、YAHIRO, S.、YAMANO, T.、NAKATANI, Y.、OURISSON, G.