A compound having the formula (1): can be produced with efficiency by using a compound represented by the formula (2): wherein R represents a protected hydroxyl group or a group represented by the formula (3): where R
1
represents an alkyl group or an aralkyl group which may be substituted; and R
2
represents an alkyl.
Inventors found that a compound shown by formula:
can be produced efficiently by using a compound shown by formula:
(wherein R is a protected hydroxy or a group shown by:
(wherein R1 is alkyl or optionally substituted aralkyl, and R2 is alkyl)).
发明者发现,一种化合物如式所示:
式所示的化合物可以高效生产:
(其中 R 是受保护的羟基或以下所示的基团
(其中 R1 为烷基或任选取代的芳基,R2 为烷基))。