Asymmetric electrophilic methoxyselenenylations and cyclizations with 3-camphorseleno derivatives
                                
                                    
                                        作者:Thomas G. Back、Brian P. Dyck、Siqiao Nan                                    
                                    
                                        DOI:10.1016/s0040-4020(98)01133-8
                                    
                                    
                                        日期:1999.3
                                    
                                    A series of novel 3-camphor-based diselenides, differing in substitution at C-2, was prepared. The corresponding allyl selenides were used as protecting groups for the diselenide moieties in several subsequent transformations. The diastereoselective methoxyselenenylation of alkenes was achieved with methanolic selenenyl triflates derived from the camphor diselenides, of which the 2-keto analogue proved
                                    制备了一系列新颖的基于3-
樟脑的二
硒烯,其在C-2处的取代不同。相应的烯丙基
硒化物在几个随后的转化中用作二
硒化物部分的保护基。用衍生自
樟脑二
硒化物的
甲醇亚
硒基
三氟甲磺酸酯可实现烯烃的非对映选择性甲氧基
硒烯化,其中2-
酮类似物被证明是最有效的。用相应的
硒烯基
氯化物最有效地进行不饱和醇,
羧酸或酰胺的非对映选择性亲电环化反应,该化合物在
樟脑残基的C-2处含有一个螺-
恶唑烷酮部分。几种产品的绝对构型由还原脱
硒法确定。