Natural phosphatidylinositol 3,4,5-trisphosphate which has been believed to have stearoyl and arachidonoyl groups at the sn-1 and -2 positions, respectively, has been synthesized using 1,2-O-cyclohexylidene-3,4-O-disiloxanyl-myo-inositol as the pivotal intermediate. (C) 1998 Elsevier Science Ltd. All rights reserved.
Resolution of synthetically useful myo-inositol derivatives using the chiral auxiliary O-acetylmandelic acid
作者:Kana M. Sureshan、Yoko Kiyosawa、Fushe Han、Sayuri Hyodo、Yuhki Uno、Yutaka Watanabe
DOI:10.1016/j.tetasy.2004.11.030
日期:2005.1
Efficient methods for the resolution of various myo-inositol derivatives have been developed using O-acetylmandelic acid (OAM) as the chiralauxiliary. Various methods of introduction of the chiralauxiliary have been compared. DCC mediated coupling between the inositol derivative and O-acetylmandelic acid resulted in substantial racemization even at 0 °C; while acylation with O-acetylmandeloyl chloride
关于各种的分辨率有效的方法肌醇肌醇衍生物已被开发使用ø -acetylmandelic酸(OAM)作为手性助剂。比较了引入手性助剂的各种方法。DCC介导的肌醇衍生物与O-乙酰基扁桃酸之间的偶合即使在0°C时也导致大量消旋。而在吡啶存在下用O-乙酰基扁桃酰氯酰化则得到非对映异构体,而手性助剂没有外消旋化。使用OAM作为手性助剂的优势在于,可以通过分析1来确定拆分的非对映异构体的绝对构型各种质子的1 H NMR化学位移。非对映异构体的分离可以通过分步结晶或柱色谱法实现。肌醇衍生物的对映异构体可通过除去手性助剂获得。通过采用已知的选择性保护-去保护策略,可以合成旋光形式的各种衍生物。
Synthesis of PI(3,4,5)P3 with unsaturated and saturated fatty acid chains
作者:Yutaka Watanabe、Mitsunobu Nakatomi
DOI:10.1016/s0040-4020(99)00551-7
日期:1999.8
Synthesis of three PI(3,4,5)P(3)s, sn-1-O-stearoyl-sn-2-O-arachidonoyl, stearoyl-linolenoyl, and distearoyl phosphatidyl-myo-inositol 3,4,5-trisphosphate with the natural configuration for the arachidonoyl version was established by employing 9-fluorenylmethyl-protected phosphate derivatives. (C) 1999 Elsevier Science Ltd. All rights reserved.
Diastereomixture and Racemate of <i>m</i><i>yo</i>-Inositol Derivatives, Stronger Organogelators than the Corresponding Homochiral Isomers
作者:Yutaka Watanabe、Tomomi Miyasou、Minoru Hayashi
DOI:10.1021/ol049737+
日期:2004.5.1
Contrary to the usually accepted phenomena, an optically heterogeneous 1:1 diastereomixture of DS and LS and a racemate of LS and DR obtained, respectively, from a racemic myo-inositol derivative and (S)- and racemic O-acetylmandelic acid formed stronger organogels, especially with aromatic fluids, than those formed from homochiral isomers, DS and LS. One of the plausible reasons for the formation of the stronger diastereomeric gel is shown to be the complementary interaction of two diastereomers.