Reaction #64611

Reaction equation

6-benzyloxy-4-methoxymethyl-β-carboline-3-carboxylic acid ethyl ester

isopropanol

→

6-benzyloxy-4-methoxymethyl-β-carboline-3-carboxylic acid isopropyl ester

Yield 80.0%

Conditions

Workup

1. 1
   ConcentrationAfter concentration
2. 2
   Extractionextracted
3. 3
   WashThe ethyl acetate phase is washed with a small amount of water
4. 4
   Otherdried
5. 5
   Filtrationfiltered
6. 6
   Concentrationconcentrated

Procedure

1.4 g (3.6 mmol) of 6-benzyloxy-4-methoxymethyl-β-carboline-3-carboxylic acid ethyl ester is boiled under reflux for 2 hours in 100 ml of isopropanol with 0.7 ml (2.2 mmol) of titanium tetraisopropoxide. After concentration, the mixture is taken up in 80 ml of 1N hydrochloric acid and extracted by shaking with 250 ml of ethyl acetate. The ethyl acetate phase is washed with a small amount of water, dried, filtered, and concentrated. After chromatography over silica gel with methylene chloride:acetone=4:1 as the eluent, the 6-benzyloxy-4-methoxymethyl-β-carboline-3-carboxylic acid isopropyl ester, mp 150°-151° C., is obtained in an 80% yield.

Source