Chiral Perfluoroalkyl‐Substituted Hexahydrofuro[2,3‐
<i>b</i>
]pyran Derivatives Based on a Carbohydrate Precursor
作者:Martin Hein、Ralf Miethchen
DOI:10.1002/(sici)1099-0690(199909)1999:9<2429::aid-ejoc2429>3.0.co;2-#
日期:1999.9
(4′R)-4,6-Di-O-acetyl-1,2,3-trideoxy-3-iodo-4′-(2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,9-heptadecafluorononyl)-2′,3′,4′,5′-tetrahydro-α-D-glucopyranoso[1,2-b]furan (2) and its (4′S) diastereomer (3) were prepared by dithionite-mediated addition of 1-iodoperfluorooctane to allyl 4,6-di-O-acetyl-2,3-dideoxy-α-D-erythro-hex-2-enopyranoside (radical “domino reaction”). Subsequently, the major product [(4′R) form]
(4' - [R)-4,6-二- ø -乙酰基-1,2,3-三脱氧-3-碘-4' - (2,2,3,3,4,4,5,5,6, 6,7,7,8,8,9,9,9-十七氟壬基)-2',3',4',5'-四氢-α-D-吡喃葡萄糖并[1,2- b ]呋喃(2)和其(4 'S)非对映异构体(3)是通过连二亚硫酸盐介导的1-碘全氟辛烷加到烯丙基4,6-二-O-乙酰基-2,3-二脱氧-α-D-赤型-己二基-庚二酮糖苷上而制得的(激进的“多米诺骨牌反应”)。随后,将主要产物[(4'R)形式]通过4脱保护为六氢呋喃[2,3- b ]吡喃衍生物5,将其用作氟化积木制备手性nonamphiphilic介晶6 - 8通过“光延”醚化和9通过酯化。用于转化的试剂5至6 - 9是4-氰基苯酚,4-(4-氰基苯基)苯酚,4-(4- heptyloxybenzoyloxy)苯酚,和4- heptyloxybenzoyl酰氯。