Glycosyl Trichloroacetimidates
3.2
471
⊡ Scheme 12
of excess building blocks, (ii) shorter reaction times for the completion of total syntheses,
and (iii) convenient purification procedures by just washing the resin. In addition, methods to
avoid undesired byproduct formation in the synthesis of the target molecules have been introduced [106,107,108,109], such as for instance capping procedures of unreacted intermediates
( > Scheme 12) [108]. Low reactive acceptor 12a after glycosylation with donor 12b is capped
with benzoyl isoyanate yielding 12c and 12d. Chain extension with 12e (→ 12c + 12f) and
cleavage led to readily separable 12g and 12h. So far, no generally accepted strategy has yet
3.2
471
⊡ Scheme 12
of excess building blocks, (ii) shorter reaction times for the completion of total syntheses,
and (iii) convenient purification procedures by just washing the resin. In addition, methods to
avoid undesired byproduct formation in the synthesis of the target molecules have been introduced [106,107,108,109], such as for instance capping procedures of unreacted intermediates
( > Scheme 12) [108]. Low reactive acceptor 12a after glycosylation with donor 12b is capped
with benzoyl isoyanate yielding 12c and 12d. Chain extension with 12e (→ 12c + 12f) and
cleavage led to readily separable 12g and 12h. So far, no generally accepted strategy has yet