Esters can be converted into the parent carboxylic acid and alcohol by heat with aq. acid or base (e.g. aq. H2SO4 or aq. NaOH).for more details, please see hydrolysis of ester in applied org.chemistry text..

use diazo derivatives

Din,

See the following article

---Vassiliki Theodorou et al., A simple method for the alkaline hydrolysis of esters. Tetrahedron Letters, 48 (46), 8230–8233 (2007).

The authors claimed hydrolysis of esters in CH2Cl2-MeOH [9:1] using sodium hydroxide at room temperature in a few minutes. It might help.

Good luck

Hydrolysis of esters is better in THF/H2O (2:1), 0oC, LiOH (3eq) in a period of 1 to 3 h, but is better following by TLC (AcOEt/MeOH, (7:3) for the case of protected aminoacids or only MeOH for the case of aminacids). Dioxane/H2O (2:1), 0oC and NaOH (1mol/L) is good too.

 Esterification can be doit with MeOH and 3eq of SOCl2(drop to drop for 30 min), 0oC, in 24h. But this method only funtion for low volatile alcohols. For other alcohol is better the Steglish esterification with 1eq of DIC, DCC or EDC an 2eq of the acid in DCM for 20 min. The DCM is rotoevapored and the mixed anhidride obteined is added to a solution of the alcohol in DMF and 0.1eq of DMAP over nigth . It might help. Good luck

acidic or basic hydrolysis of ester depend on the chemical nature of ester