except 11 (+)-2, are of good yield. On the basis of previous chemical transformations, this also establishes the (4R)-configuration for penlanfuran ((−)-1) and other sesquiterpenoids of the sponge Dysidea fragilis from the North-Brittanysea. Non viable routes to (±)-noroxoperlanfuran ((±)-2) are also discussed.
在Me 3 SiCl存在下,在THF中向溴化(+)-(4 s)-cryptone((+)- 6)中的1,4-溴化乙烯基溴化镁/ CuBr-SMe 2生成甲硅烷基酚醚7,该甲硅烷基醚7会部分水解在含水后处理中酮8 ; 将残余的7用对甲苯磺酸吡啶鎓(PyT s OH)水解,得到8,将其用乙二醇原位保护,然后进行臭氧处理,得到醛()-10 。后者在加入3-lithiofuran之后脱水和脱保护。与Py T s OH结合,得到不自然的(4 S)-对映戊烷呋喃的对映体(+)- 2。除了11(+)- 2以外,所有过程的收率都很高。在以前的化学转化的基础上,这也为北布列塔尼海的脆弱海绵状Dydyda的戊兰呋喃((-)- 1)和其他倍半萜类化合物建立了(4 R)-构型。还讨论了到(±)-诺哌喃呋喃((±)-2)的不可行路线。
MANCINI, INES;GUELLA, GRAZIANO;CAVAZZA, MARINO;PIETRA, FRANCESCO, HELV. CHIM. ACTA, 73,(1990) N, C. 652-658
作者:MANCINI, INES、GUELLA, GRAZIANO、CAVAZZA, MARINO、PIETRA, FRANCESCO
DOI:——
日期:——
The role of boron trifluoride etherate in reactions of lower order (Gilman) organocuprates
作者:Bruce H. Lipshutz、Edmund L. Elsworth、Teruna J. Siahaan
DOI:10.1021/ja00186a031
日期:1989.2
Cyclobutene bridgehead olefin route to the American cockroach sex pheromone, periplanone-B