申请人:University of Rochester
公开号:US04294763A1
公开(公告)日:1981-10-13
The present invention provides compounds having the structure: ##STR1## wherein R.sup.1 represents alkoxy or aralkoxy, R.sup.2 represents hydrogen, alkoxy, aralkoxy, alkyl, aralkyl, or R.sup.1 and R.sup.2 taken together represent the group --O--CH.sub.2 --O--, R.sup.3 represents hydrogen, alkyl, aralkyl, acyl or a protecting group, Y represents Cl, Br, I or a leaving group; and X represents Cl, Br or I. The present invention also provides a process for preparation of compounds VI in a single step wherein X and Y are the same and represent Cl, Br, or I, and R.sup.3 is as previously defined except that in this instance, it does not represent a protecting group. According to another aspect of the present invention there are provided compounds VII-a and VII-b having the structure: ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are as previously defined, j is an integer having a value of 0 or 1, Z.sup.1 represents a non-reacting electron withdrawing group, and Z.sup.2 represents a non-reacting electron withdrawing group or hydrogen, R.sup.8 and R.sup.9 are the same or different and represent hydrogen, alkyl, aralkyl, alkoxy, or aralkoxy, and R.sup.7 represents hydrogen, alkyl, aralkyl or acyl. Compounds VII-a may be prepared from compounds VI through the use of the process of "insertion-cyclization" which is provided by another aspect of the present invention. According to a further aspect of the present invention, compounds VII-a are converted into tetralone III-a shown below: ##STR3## wherein R.sup.1, R.sup.2, R.sup.3, Z.sup.1, Z.sup.2, R.sup.7, R.sup.8 and R.sup.9 are as previously defined. Certain of these compounds can, in turn, be readily converted into picropodophyllin and picrosikkimotoxin. The latter can be converted into known antineoplastic agents by known procedures.
本发明提供具有以下结构的化合物:##STR1##
其中R.sup.1代表烷氧基或芳基烷氧基,R.sup.2代表氢、烷氧基、芳基烷氧基、烷基、芳基烷基,或R.sup.1和R.sup.2共同代表--O--CH.sub.2--O--基团,R.sup.3代表氢、烷基、芳基烷基、酰基或保护基,Y代表Cl、Br、I或离去基;X代表Cl、Br或I。本发明还提供一种制备化合物VI的单步法,其中X和Y相同且代表Cl、Br或I,R.sup.3如前所述,但在本例中,它不代表保护基。根据本发明的另一方面,提供具有以下结构的化合物VII-a和VII-b:##STR2##
其中R.sup.1、R.sup.2和R.sup.3如前所述,j是一个值为0或1的整数,Z.sup.1代表非反应的电子 withdrawing基团,Z.sup.2代表非反应的电子 withdrawing基团或氢,R.sup.8和R.sup.9相同或不同,代表氢、烷基、芳基烷基、烷氧基或芳基烷氧基,而R.sup.7代表氢、烷基、芳基烷基或酰基。通过本发明提供的“插入-环化”过程,可以从化合物VI制备化合物VII-a。根据本发明的进一步方面,化合物VII-a可转化为下图所示的四环酮III-a:##STR3##
其中R.sup.1、R.sup.2、R.sup.3、Z.sup.1、Z.sup.2、R.sup.7、R.sup.8和R.sup.9如前所述。其中某些化合物可以轻松地转化为皮克罗波多菲林和皮克罗斯基莫毒素。后者可以通过已知的方法转化为已知的抗肿瘤剂。