作者:Thottumkara K. Vinod、Harold Hart                                    
                                    
                                        DOI:10.1021/jo00019a032
                                    
                                    
                                        日期:1991.9
                                    
                                    Two approaches to the synthesis of vaulted cappedophanes 3v are described.  In the first, the walls and ceiling were prefabricated as in tetrathiol 5 (10a and 10b, Scheme II, are specific examples), which was then coupled with a m-terphenyl tetrabromide such as 4.  This route was most successful when the m-terphenyl base carried a large substituent (Ph, Br) in the 5' position.  Thus tetrathiol 10a and tetrabromide 25 gave vaulted cappedophane 27v in good yield (Scheme VIII).  In the absence of a 5' substituent, the major product was the self-filled conformer.  For example, 10a and 4 gave mainly 11sf (62%) and only 2% of its vaulted conformer 11v (Scheme III), and tetrathiol 10b reacted with 4 to give (79%) only the self-filled conformer 15sf (Scheme IV).  In the second approach, a cuppedophane with suitably functionalized walls was first constructed, and the cap was attached in a second step.  For example, bisphenol 29, when coupled with p-xylylene dibromide, gave mainly vaulted conformer 11v (51%) and only a trace of 11sf (Scheme IX).  Extension of this method to several other dihalides, however, gave mainly self-filled conformers (Schemes XI and XII) and even p-xylylene dibromide gave only self-filled product 33sf when the bisphenol contained a substituent at C2' of the m-terphenyl base (Scheme XIII).  The reasons for the predominant formation of self-filled vis-a-vis vaulted cappedophane conformers are discussed.  These studies open the way for the synthesis of vaulted cappedophanes containing functionality within the molecular cavity.