Reaktion #5044

Reaktionsgleichung

6-methyl-3-bromopyridazine

DIPEA

4-hydroxypiperidine

→

Formula IV

6-n-propyl-3-(4-hydroxy-1-piperidinyl)pyridazine

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturheated to 120° for 16 hours

Vorschrift

Following a procedure similar to that of Example 3, 81 millimoles of 6-methyl-3-bromopyridazine was combined with 16 mL DIPEA and 163 mmoles of 4-hydroxypiperidine and heated to 120° for 16 hours to obtain 6-methyl-3-(4-hydroxy-1-piperdinyl)pyridazine (Formula IV: Y=bond, R=CH3) in 24% yield. 6.8 Mmols of the latter and 7.4 mmoles of 2-methyl-5-(4-hydroxy-3,5-dimethyl phenyl)-2H-tetrazole (Formula III: R2 =R3 =R4 =CH3) were reacted with equimolar amounts of DEAD and TPP essentially as described above in Example 1c. Recrystallization from methanol gave a 74% yield of the compound of Formula I (R1 =R2 =R3 =R4 =CH3, Y=bond), m.p. 188°-189° C.

Quelle