Angular2 beta and gulp-tsc - Cannot find module 'angular2/core'

I am trying to automate the typescript compilation with the new angular 2.0 beta.

The project structure is:

myapp
|--node_modules
     |---angular2
            |--core.d.ts
            |--...
|--lib
    |--resources
         |--app
             |--app.component.ts
|--typings
     |--..
.
|--package.json
|--gulpfile.js

app.component.ts excerpt:

import {Component, View} from 'angular2/core';
import {TechnologiesService} from './services';

When I run the typescript command (tsc) directly from the shell everything goes well and the javascript files are generated. However when I run my gulp compile task there are some errors because it doesn't find angular2/core and angular2/platform/browser modules. Why?

[16:35:55] Using gulpfile C:\dev\myapp\gulpfile.js
[16:35:55] Starting 'compile-ts'...
[16:35:55] Compiling TypeScript files using tsc version 1.8.2
[16:35:56] [tsc] > lib/resources/app/app.component.ts(1,46): error TS2307: Cannot find module 'angular2/core'.
[16:35:56] [tsc] > lib/resources/app/app.component.ts(44,14): error TS1219: Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option to remove this warning.
[16:35:56] [tsc] > lib/resources/app/main.ts(1,28): error TS2307: Cannot find module 'angular2/platform/browser'.
[16:35:56] Failed to compile TypeScript: Error: tsc command has exited with code:2

events.js:154
      throw er; // Unhandled 'error' event
      ^
 Error: Failed to compile: tsc command has exited with code:2

gulpfile typescript compilation task:

var gulp = require('gulp');
var plugins = require('gulp-load-plugins')();
var typescript = require('gulp-tsc');
gulp.task('compile-ts', function(){
  return gulp.src(['./lib/resources/app/**/*.ts'])
    .pipe(typescript({"target": "es5", "module": "system", "moduleResolution": "node", "sourceMap": true,
                      "experimentalDecorators": true, "emitDecoraasdftorMetadata": true, "removeComments": false,
                      "noImplicitAny": false}))
    .pipe(gulp.dest('./public/app/'));
});